This was a bit trickier than I thought due to FAT file system's 4 GB file size limit. My steps are summarized below in case they're helpful for anyone else.. USB memory stick used was an OCZ Diesel 8 GB.
- used "shred" command to blank memory stick - used GParted to create 2 partitions: (1) a 1 GB FAT16 partition that I made bootable via Manage Flags; (2) the remainder (~6.6 GB) I formatted to ext3 - followed the instructions here http://www.debian.org/releases/stable/i386/ch04s03.html.en for the FAT16 partition. - unmounted FAT16 partition, then mounted ext3 partition and copied dvd .iso image into ext3 partition Booted from the USB stick and the Debian installer began. Didn't install yet (just tested to see if it booted to the .iso and it looks like it started okay) but I anticipate this working when I try to install tonight. Just wanted to share since it's not documented anywhere that I looked, for using a dvd .iso instead of a cd .iso image. Thanks for reading, Mark